1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.dexgen.rop.code;
18
19/**
20 * Implementation of {@link TranslationAdvice} which conservatively answers
21 * {@code false} to all methods.
22 */
23public final class ConservativeTranslationAdvice
24        implements TranslationAdvice {
25    /** {@code non-null;} standard instance of this class */
26    public static final ConservativeTranslationAdvice THE_ONE =
27        new ConservativeTranslationAdvice();
28
29    /**
30     * This class is not publicly instantiable. Use {@link #THE_ONE}.
31     */
32    private ConservativeTranslationAdvice() {
33        // This space intentionally left blank.
34    }
35
36    /** {@inheritDoc} */
37    public boolean hasConstantOperation(Rop opcode,
38            RegisterSpec sourceA, RegisterSpec sourceB) {
39        return false;
40    }
41
42    /** {@inheritDoc} */
43    public boolean requiresSourcesInOrder(Rop opcode,
44            RegisterSpecList sources) {
45        return false;
46    }
47
48    /** {@inheritDoc} */
49    public int getMaxOptimalRegisterCount() {
50        return Integer.MAX_VALUE;
51    }
52}
53